Qualtrics Survey Xblock

  Author fields in Studio:
   - Display Name
   - Survey ID
   - Your University
   - Link Text
   - Parameter Name for UserID

  If Parameter Name is left blank, the anonymous student id is
  omitted from the url.

  Links to an already existing Qualtrics survey.
It looks like we're not really using any of these variables, outside of
the `make_one` method. How about refactoring these into local variables
of your factory method? At that point, we can also remove the `setup`
method entirely.

```python
def make_xblock(self, **kwargs):
    course_id = SlashSeparatedCourseKey.from_deprecated_string('foo/bar/baz')
    runtime = mock.Mock(course_id=course_id)
    scope_ids = mock.Mock()
    field_data = DictFieldData(kwargs)
    xblock = QualtricsSurvey(runtime, field_data, scope_ids)
    xblock.xmodule_runtime = runtime
```